Units converter


A collection of tables and links with some useful information about conversion of units.


Conversion factors between SI and US unit systems

Unit to convert

from

to

Multiply for

Length

ft

m

0,3048

Surface

ft2

m2

0,092903

Volume

ft3

m3

0,028317

Mass

lb

kg

0,45359

Time

h

s

3600

Acceleration

m/ h2

m/ s2

7,7160 10-8

Mass Flow Rate

lb/h

kg/ s

1,260 10-4

Density

lb/ft3

kg/m3

16,018

Force

lbf

N

4,4482

kgf

N

9,8066

Pressure

kgf/cm2

N/m2

98066

Difference of Temperature

°F

K

0,55556

Heat Quantity

Btu

J

1055,07

kcal

J

4186,8

Thermal Power

Btu/h

W

0,29307

kcal/h

W

11,630

Specific Heat

Btu/(lb °F)

J/(kg K)

4186,8

kcal/(kg °C)

J/ (kg K)

4186,8

Thermal Conductivity

Btu/(ft h °F)

W/(m K)

1,73078

kcal/(m h °C)

W/(m K)

1,163

Dinamic Viscosity

lb/(ft h)

kg/(m s)

4,1342 10-4


Power conversion

Power

W

Kpm/s

CV

HP

W

1

0,102

1,36 ×10-3

1,34 ×10-3

Kpm/s

9,80

1

0,01333

0,01315

CV

736

75

1

0,986

HP

745,2

76,04

1,014

1

               Ex: 2 W = 2 x 1,34 ×10-3 HP

Legenda:          W: Watt,

Kpm/s: kilogram meter per second,

CV: cavallo-vapore, 

HP: horse-power


Energy conversion

Energy

J


erg


cal


eV

J

1

107

0,239

6,24×1018

erg

10-7

1

2,39×10-8

6,24×1011

cal

4,184

4,184×107

1

2,61×1019

eV

1,602×10-19

1,602×10-12

3,83×10-20

1

                  Ex: 2 J = 2 x 0,239 cal

Legenda:  J: Joule, 

erg: Erg, 

cal: calorie, 

eV: electronvolts


Pressure conversion

Pressure

Pa


atm


bar


torr (mmHg)


mH2O


kp/cm2

Pa

1

9,869×10-6

10-5

7,5×10-3

1,019×10-4

1,019×10-5

atm

1,013×105

1

1,013

763,3

10,33

1,033

bar

105

0,9869

1

750

10,2

1,02

torr (mmHg)

1,333×102

1,31×10-3

1,333×10-3

1

0,0135

0,00135

mH2O

9,81×103

0,0968

0,098

73,5

1

0,1

kp/cm2

9,81×104

0,968

0,98

735,7

10

1

Ex: 2 atm = 2 x 763,3 torr

Legenda:   Pa: Pascal (N/m2),

atm: atmosphere,

torr: Torricelli or millimeters of mercury,

mH2O: meters of water,

kp/cm2: kilogram per square centimeter


Relationships between scales of temperatures

T(K)      = T(°C) + 273,15  = 5/9 T(°F) + 255,37    = 5/4 T(°R) +273,15

T(°C)     = T(K) – 273,15  = 5/9 [T(°F) – 32] = 5/4 T(°R)

T(°F)     = 9/5 [T(K) – 255,37] = 9/5 T(°C) +32 = 9/4 T(°R) +32

T(°R)     = 4/5 [T(K) – 273,15] = 4/5 T(°C) = 4/9 [T(°F) –32]


Legenda:    K: Kelvin or Absolute Temperature scale 

         °C: Celsius degree

         °F: Fahrenheit degree

         °R: Réamur degree


Intuitive relationships

Temperature


Water freezing


Water boiling point

K

273,15

373,15

°C

0

100

°F

32

212

°R

0

80


Length - Distance

meter

m

1 m = 0,001 km = 39,37 in = 3,28 ft = 1,09 yd

centimeter

cm

1 cm = 0,01 m = 0,3937 in = 0,0328 ft = 0,0109 yd

kilometer

km

1 km = 1000 m = 1093,61 yd = 0,5396 naut mi = 0,62137 mi

inch

1", in

1 in = 0,0833 ft = 0,0278 yd = 2,54 cm = 0,0254 m

foot

1', ft

1 ft = 12 in = 0,333 yd = 30,48 cm = 0,3048 m

yard

yd

1 yd = 3 ft = 36 in = 91,44 cm = 0,9144 m

nautical mile

naut mi

1 naut mi = 1,853 km = 1'853,18 m = 2'026,67 yd = 1,151 mi

mile US

mi

1 mi = 1,609 km = 1'609,35 m = 1'760 yd = 0,868 naut mi

hand

hand

1 hand = 4 in = 0,3332 ft = 0,111 yd = 10,16 cm = 0,1016 m

span

span

1 span = 9 in = 0,7497 ft = 0,25 yd = 22,86 cm = 0,2286 m

 

Superface - Area

Square meter

1 m² = 10'000 cm² = 0,0001 ha = 1.550 in²  = 10,76 ft² = 1,196 yd²

Square centimeter

cm²

1 cm² = 0,0001 m² = 0,155 in² = 0,0011 ft² = 0,00012 yd²

Square kilometer

km²

1 km² = 1'000'000 m² = 100 ha  = 0,386 mi²  = 247,105 ac

ara

a

1a = 100 m² = 0,01 ha = 1'076,39 ft² = 119,599 yd² = 0,0000386 mi² = 0,024 ac

hectare

ha

1 ha  = 100 a = 10'000 m²  = 0,01 km²  = 107'639,1 ft²  = 0,0039 mi²  = 2,47 ac

square inch

in²

1 in² = 0,00694 ft² = 6,4516 cm²

square foot

ft²

1 ft²  = 0,092 m²  = 144 in² = 0,111 yd²

square yard

yd²

1 yd² = 0,836 m² = 8'361,27 cm² = 9 ft² = 1'296 in² = 0,0002 ac

square mile

mi²

1mi² = 2,59 km²  = 259 ha  = 640 ac

acre

ac

1 ac = 4'046,86 m² = 0,0040 km² = 0,40 ha = 40,47 a = 43.560 ft² = 4840 yd² = 0,00156 mi²



Volume

cubic meter

1 m³ = 1'000 dm³ = 35,3146 ft³ = 61'023,744 in³ = 1,308 yd³ = 264,20 galUS = 219,97 galUK

cubic decimeter; liter

dm³

1 dm³ = 1 l = 0,001 m³ = 61,024 in³ = 0,0353 ft³ = 0,00131 yd³ = 0,26417 galUS = 0,21997 galUK

cubic centimeter

cm³, cc

1 cm³ = 0,001 dm³ = 0,001 l = 0,061 in³ = 0,000264 galUS = 0,00022gal UK

cubic inch

in³

1 in³ = 0,0000164 m³ = 0,0164 dm³ = 0,0005787 ft³ = 0,0043 galUS = 0,0036 galUK

cubic foot

ft³

1 ft³ = 0,02832 m³ = 28,32 dm³ = 1'728 in³ = 0,037 yd³ = 7,48 galUS = 6,23 galUK

cubic yard

yd³

1 yd³ = 0,764 m³ = 764,55 dm³ = 46'656 in³ = 27 ft³ = 201,97 galUS = 168,18 galUK

gallon US

galUS

1 galUS = 0,00378 m³ = 3,785 dm³ = 231 in³ = 0,134 ft³ = 0,0049 yd³ = 0,833 galUK

gallon UK

galUK

1 galUK = 0,00455 m³ = 4,546 dm³ = 277,42 in³ = 0,16 ft³ = 0,0059 yd³ = 1,2 galUS

Force

Newton

N

1 N = 0,102 kgf = 0,0001 t = 0,2248 lbf = 3,597 ozf

kilogram force/weight

kgf;

1 kgf = 9,81 N = 0,001 t = 2,204 lbf = 35,27 ozf

tonne (weight)

t

1 t = 9806,65 N = 1000 kgf = 2204,62 lbf = 35'274 ozf

kilopound

kip

1 kip = 4'448 N = 453,59 kgf = 1'000 lbf = 16'000 ozf

pound force

lbf

1 lbf = 4,448 N = 0,454 kgf = 16 ozf

ounce force

ozf

1 ozf = 0,278 N = 0,028kgf = 0,0625 lbf

 
 

Pressure

pascal

Pa

1 Pa = 1 N/m²    1 kPa = 0,01 bar = 0,1 N/cm² = 0,10 mH2O = 7,5 mmHg = 0,0099 atm =0,145 psi = 0,02088 lbf/ft² = 0,334 ftH2O

bar

bar

1 bar = 100000 Pa = 100 kPa = 1,0197 kg/cm²  = 10,198 mH2O = 750 mmHg = 0,987 atm = 14,5 psi = 33,455 ftH2O

millibar

mbar

1 mbar = 100 Pa = 0,010 mH2O = 0,750 mmHg = 0,00102 kg/cm² = 0,0145 psi = 2,088 ldf/ft² = 0,033 ftH2O

millimeters of mercury

mmHg

1 mmHg = 133,322 Pa = 0,133 kPa = 0,00133 bar = 0,0136 mH2O = 0,00131 atm = 0,00136 kg/cm² = 0,01934 psi = 2,78 ldf/ft² = 0,045 ftH2O

technical atmosphere = kgf/cm²

at, kg/cm²

1 at = 1 kg/cm² = 735,56 mmHg = 10 mH2O = 98066,50 Pa = 98,067 kPa = 0,981 bar = 0,968 atm = 14,22 psi = 2048,16 lbf/ft² = 32,81 ftH2O

metric atmosphere

atm

1 atm = 101325 Pa = 760 mmHg = 1,033 at = 10,33 mH2O = 1,01 bar = 14,696 psi = 2116,22 lbf/ft² = 33,9 ftH2O

meters water column

mH2O

1 mH2O = 9806 Pa = 0,09806 bar = 73,55 mmHg = 0,9806 N/cm² = 0,09678 atm = 0,0999 at = 1,4224 psi = 204,8 lbf/ft² = 3,28 ftH2O

foot of water

ftH2O

1 ftH2O = 2988,87 Pa = 0,0299 bar = 0,3048 mH2O = 22,419 mmHg = 0,0295 atm = 0,03048 kg/cm² = 0,4335 psi = 62,42 lbf/ft²

pounds per square inch

psi

1 psi = 6894,76 Pa = 6,894 kPa = 0,069 bar = 0,703 mH2O = 51,715 mmHg = 0,689 N/cm² = 0,068 atm = 0,0703 kg/cm² = 144 lbf/ft² = 2,31 ftH2O

pounds per square foot

lbf/ft²

1 lbf/ft² = 2'988,87 Pa = 2,99 kPa = 0,0299 bar = 0,3048 mH2O = 22,418 mmHg = 0,299 N/cm² = 0,0295 atm = 0,0305 at = 0,433 psi = 62,424 lbf/ft²

 

Power

kilowatt

kW

1 kW = 1,36 CV = 1,34 hp = 737,56 lbf·ft/s = 44253,7 lbf·ft/min = 859,84 kcal/h = 3'412,14 btu/h = 101,97 kgf·m/s

cavallo vapore

CV

1 CV = 0,735 kW = 0,986 hp = 75 kg·m/s = 542,47 lbf·ft/s = 632,41 kcal/h = 2509,62 btu/h = 75 kgf·m/s

Kilogram force meter per second

kgf ·m/s

1 kgf·m/s = 0,01 kW = 0,013 CV = 0,013 hp = 7,23 lbf·ft/s = 433,98 lbf·ft/min = 8,43 kcal/h = 33,46 btu/h

Kilocalorie per hour

kcal/h

1 kcal/h = 0,0012 kW = 0,0016 CV = 0,00156 hp = 0,8578 lbf·ft/s = 51,47 lbf·ft/min = 3,97 btu/h = 0,12 kgf·m/s

horsepower

HP

1 HP = 1,014 CV = 0,746 kW = 550 lbf·ft/s = 33000 lbf·ft/min = 641,19 kcal/h = 2'544,43 btu/h = 76,04 kgf·m/s

foot pound force per second

lbf ·ft/s

1 lbf·ft/s = 0,0013 kW = 0,0018 CV = 0,0018 hp = 60 lbf·ft/min = 1,166 kcal/h = 4,63 btu/h = 0,138 kgf·m/s

foot pound force per minute

lbf ·ft/min

1 lbf·ft/min = 0,000023 kW = 0,0167 lbf·ft/s = 0,019 kcal/h = 0,077 btu/h = 0,0023 kgf·m/s

british termal unit per hour

BTU/h

1 btu/h = 0,00029 kW = 0,216 lbf·ft/s = 12,97 lbf·ft/min = 0,25 kcal/h = 0,030 kgf·m/s

 

Work - Energy - Moment - Coupple - Heat

joule

J

1 J = 1N·m = 0,102 kgf·m = 0,00024 kcal = 8,85 lbf·in = 0,74 lbf·ft = 0,00095 BTU

Kilogram force per meter

kgf·m

1 kgf·m = 9,807 J = 0,0023 kcal = 86,80 lbf·in = 7,233 lbf·ft = 0,0093 BTU

cavallo vapore per hour

CV·h

1 CV·h = 270000 kgf·m = 0,736 kW·h = 632,41 kcal = 2'509 BTU

kilocalorie

kcal

1 kcal = 4,1868 kJ = 426,93 kgf·m = 0,0016 CV·h = 0,0012 kW·h = 37056,3 lbf·in = 3088 lbf·ft = 3,97 BTU

kilowatt per hour

kW·h

1 kW·h = 3600 kJ = 1,36 CV·h = 859,8 kcal = 3412,14 BTU

pound force inch

lbf·in

1 lbf·in = 0,113 J = 0,0115 kgf·m = 0,083 lbf·ft = 0,0001 BTU

pound force foot

lbf·ft

1 lbf·ft = 1,356 J = 0,138 kgf·m = 0,324 cal = 12 lbf·in = 0,0013 BTU

horse power hour

HP·h

1 HPh = 2,684 MJ = 641,19 kcal = 1,014 CV·h = 0,746 kW·h = 1980000 lbf·ft = 2'544,43 BTU

british thermal unit

BTU

1 BTU = 1055,056 J = 107,58 kgf·m = 0,0004 CV·h = 0,252 kcal = 0,00029 kWh = 9'338,03 lbf·in = 778,17 lbf·ft

 

Density

kilogram per cubic meter

kg/m³

1 kg/m³ = 0,001 kg/dm³ = 0,001 t/m³ = 0,001 g/cm³ = 0,062 lb/ft³ = 0,00075 tn/yd³ = 0,00084 s tn/yd³ = 0,133 oz/gal

tonne per cubic meter

t/m³

1 t/m³ = 1000 kg/m³ = 1 kg/dm³ = 0,001 kg/cm³ = 1 g/cm³ = 62,43 lb/ft³ = 0,036 lb/in³ = 0,752 tn/yd³ = 0,843 s tn/yd³ = 133,53 oz/gal

kilogram per cubic decimeter

kg/dm³

1 kg/dm³ = 1'000 kg/m³ = 0,001 g/cm³ =1 t/m³ = 1 g/cm³ = 62,42 lb/ft³ = 0,036 lb/in³ = 133,53 oz/gal

pound per cubic inch

lb/in³

1 lb/in³ = 27,68 kg/dm³ = 0,02768 kg/cm³ = 27,68 t/m³ = 27,68 g/cm³ = 1728 lb/ft³ = 20,83 tn/yd³ = 23,33 s tn/yd³ = 3696 oz/gal

pound per cubic foot

lb/ft³

1 lb/ft³ = 16,018 kg/m³ = 0,016 kg/dm³ = 0,016 t/m³ = 0,016 g/cm³ = 0,00058 lb/in³ = 0,012 tn/yd³ = 0,0135 s tn/yd³ = 2,14 oz/gal

ounce per gallon

oz/gal

1 oz/gal = 7,489 kg/m³ = 0,00749 kg/dm³ = 0,00749 t/m³ = 0,00749 g/cm³ = 0,467 lb/ft³ = 0,00027 lb/in³ = 0,00563 tn/yd³ = 0,0063 oz/gal

 

Flow rate in Volume

cubic meter per second

m³/s

1 m³/s = 60 m³/min = 3600 m³/ora = 1000 l/s = 60000 l/min = 6102374,42 in³/s = 2118,88 ft³/min = 15850,32 gpm = 13198,13 I gpm

cubic meter per minute

m³/min

1 m³/min = 0,0167 m³/s = 60 m³/h = 16,67 l/s = 1'000 l/min = 35,31 ft³/min = 264,17 gpm = 219,97 I gpm

cubic meter per hour

m³/h

1 m³/h  = 0,000278 m³/s = 0,0167 m³/min = 0,28 l/s = 16,67 l/min = 1017,06 in³/min = 0,588 ft³/min = 4,40 gpm = 3,66 I gpm

liters per seconds

l/s

1 l/s = 0,001 m³/s = 0,06 m³/min = 3,6 m³/h = 60 l/min = 3661,42 in³/min = 2,12 ft³/min = 15,85 gpm = 13,198 I gpm

liters per minute

l/min

1 l/min = 0,001 m³/min = 0,06 m³/h = 0,0167 l/s = 61,024 in³/min = 0,035 ft³/min = 0,264 gpm = 0,22 Igpm

cubic inch per minute

in³/min

1 in³/min = 0,00027 l/s = 0,016 l/min = 0,00058 ft³/min = 0,0043 gpm = 0,0036 I gpm

cubic foot per minute

ft³/min

1 ft³/min = 0,00047 m³/s = 0,028 m³/min = 1,7 m³/h = 0,472 l/s = 28,32 l/min = 1728 in³/min = 7,48 gpm = 6,23 I gpm

gallon per minute

gpm

1 gpm = 0,0038 m³/min = 0,227 m³/h = 0,063 l/s = 3,785 l/min = 231 in³/min = 0,134 ft³/min = 0,833 I gpm

imperial gallon per minute

I gpm

1 I gpm = 0,000076 m³/s = 0,00454 m³/min = 0,273 m³/h = 0,076 l/s = 4,55 l/min = 277,42 in³/min = 0,16 ft³/min = 1,2 gpm

 

Speed

meters per second

m/s

1 m/s = 60 m/min = 3,6 km/h = 39,37 in/s = 2'362,2 in/min = 3,28 ft/s = 196,85 ft/min = 2,237 mi/h = 1,94 kn

kilometers per hour

km/h

1 km/h = 0,278 m/s = 16,67 m/min = 10,963 in/s = 656,17 in/min = 0,91 ft/s = 54,68 ft/min = 0,62 mi/h = 0,54 kn

meters per minute

m/min

1 m/min = 0,0167 m/s = 0,06 km/h = 0,66 in/s =39,37 in/min = 0,0547 ft/s = 3,28 ft/min = 196,85 ft/h = 0,037 mi/h = 0,032 kn

inch per second

in/s

1 in/s = 0,0254 m/s = 1,524 m/min = 0,091 km/h = 60 in /min = 0,083 ft/s = 5 ft/min = 300 ft/h = 0,057 mi/h = 0,049 kn

inch per minute

in/min

1 in/min = 0,0254 m/min = 0,001524 km/h = 0,167 in/s = 0,0014 ft/s = 0,083 ft/min = 5 ft/h

foot per second

ft/s

1 ft/s = 0,305 m/s = 18,288 m/min = 1,097km/h = 12 in/s = 720 in/min = 60 ft/min = 0,68 mi/h = 0,59 kn

foot per minute

ft/min

1 ft/min = 0,00508 m/s = 0,3048 m/min = 0,0183 km/h = 0,2 in/s = 12 in/min = 0,0167 ft/s = 60 ft/h = 0,011 mi/h = 0,0099 kn

foot per hour

ft/h

1 ft/h = 0,005 m/min = 0,0033 in/s = 0,2 in/min = 0,0167 ft/min

mile per hour

mi/h

1 mi/h = 0,447 m/s = 26,82 m/min = 1,609 km/h = 17,6 in/s = 1056 in/min = 1,47 ft/s = 88 ft/min = 0,87 kn

nautical mile per hour = knot

kn

1 kn = 0,51 m/s = 30,89 m/min = 1,85 km/h = 20,27 in/s = 1216 in/min = 1,69 ft/s = 101,33 ft/min = 1,15 mi/h

 

Angular speed

radiants per second

rad/s

1 rad/s = 60 rad/min = 0,159 rev/s = 9,55 rpm

radiants per minute

rad/min

1 rad/min = 0,0167 rad/s = 0,0026 rev/s = 0,159 rpm

revolutions per second

rev/s = rps

1 rev/s = 60 giri/min = 6,283 rad/s = 376,99 rad/min

revolutions per minute - rpm

rev/m = rpm

1 rpm = 0,0167 rev/s = 0,1047 rad/s = 6,283 rad/min

 

Acceleration

meter per square second

m/s²

1 m/s² = 100 cm/s² = 0,001 km/s² = 3,28 ft/s² = 39,37 in/s² = 0,00062 mi/s²

centimeter per square second

cm/s²

1 cm/s² = 0,01 m/s² = 0,00001 km/s² = 0,0328 ft/s² = 0,394 in/s²

kilometer per square second

km/s²

1 km/s² = 1'000 m/s² = 100000 cm/s² = 3280,84 ft/s² = 39370,08 in/s² = 0,621 mi/s²

foot per square second

ft/s²

1 ft/s² = 0,3048 m/s² = 30,48 cm/s² = 12 in/s²

inch per square second

in/s²

1 in/s² = 0,0254 m/s² = 2,54 cm/s² = 0,083 ft/s²

mile per square second

mi/s²

1 mi/s² = 1609,34 m/s² = 1,609 km/s² = 5280 ft/s² = 63360 in/s²

 

Here the links to useful Units convertion websites:

 

http://www.convert-me.com/

 

http://www.onlineconversion.com/

 

http://www.onlineunitconversion.com/

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